This study determined the contribution of Social Institutions on Flexible Learning of Philippine History in Bulacan Agricultural State College Main Campus during the second semester of Academic Year 2020-2021.With Quantitative method of research as research design and 238 students as respondents of the study, findings disclosed the students agreed that family had contributions on Flexible Learning of Philippine History. Likewise, these respondents agreed that the school had a contribution on their Flexible Learning of the subject. The students agreed that their peers had a contribution on their Flexible Learning of Philippine History in terms of academic support, personal support, positive interaction and acceptance of new challenges. Similarly, the students agreed that the community where they live had a contribution on their Flexible Learning. In the same manner, they agreed that the state had a contribution on their Flexible Learning. The academic performance of the students in Philippine History was described as “very satisfactory”. Based on the findings of the study, the conclusion that there is a significant relationship between Social Institutions (family, school, peer and state) on Flexible Learning and students’ academic performance in Philippine History was drawn. The higher the support from family, school, peers and state, the higher the grades of the students in Philippine History under the Flexible Learning environment.